My Maine Coon cat likes to lay in the sink, too. He's over 20 pounds. I just put a picture of him down in the Coffeehouse.
Abacat has never actually gotten IN the plant before like this...but today I brought her home from the hospital (spayed) and when I finally got her to come out of the closet she got in that plant and took a nap. She usually just plays with the rocks I have on top of the soil.